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Long-Term Debt and Liquidity Matters - Narrative (Details) | Jun. 30, 2023 USD ($) | Jan. 06, 2023 USD ($) | Feb. 11, 2022 USD ($) MW | Sep. 30, 2023 USD ($) | Aug. 04, 2023 USD ($) | Apr. 10, 2023 USD ($) | Apr. 09, 2023 USD ($) creditFacility | Dec. 16, 2022 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Equity infusion from Pinnacle West |  | $ 150,000,000 |  |  |  |  |  |
BCE |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Solar plant capacity (in MW) | MW |  |  | 31 |  |  |  |  |
Battery storage capacity (in MW) | MW |  |  | 20 |  |  |  |  |
5.55% Unsecured Senior Notes Due Aug 2033 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Notes issued | $ 500,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.55% |  |  |  |
Revolving Credit Facility | Revolving Credit Facility Maturing May 2026 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  |  | $ 500,000,000 |
Number of line of credit facilities | creditFacility |  |  |  |  |  |  | 2 |
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | $ 1,250,000,000 |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 1,650,000,000 |  |
Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  | $ 0 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 5.44% |  |  |  |
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028, Facility Two | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 400,000,000 |  |
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028, Facility One | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 400,000,000 |  |
Letter of Credit | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | $ 8,000,000 |  |  |  |
Letter of Credit | Revolving Credit Facility Maturing April 2028 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | 0 |  |  |  |
Commercial Paper | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  |  |  |  |  | 1,000,000,000 | $ 750,000,000 |
Commercial Paper | Revolving Credit Facility Maturing April 2028 | APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Commercial paper |  |  |  | 313,000,000 |  |  |  |
Term Loan | Non-Recourse Construction Term Loan Facility | BCE |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 36,000,000 |  |  |  |  |
Bridge Loan | Equity Bridge Loan Facility | BCE |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 31,000,000 |  | $ 31,000,000 |  |  |
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | 200,000,000 |  |
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing April 2028 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | 200,000,000 |  |
Long-term line of credit |  |  |  | 0 |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | $ 300,000,000 |  |
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing April 2028 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | 0 |  |  |  |
Pinnacle West | Commercial Paper | Revolving Credit Facility Maturing April 2028 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Commercial paper |  |  |  | $ 111,000,000 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 5.45% |  |  |  |
Pinnacle West | Term Loan |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 175,000,000

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